From 805ec389f00d0c78c16a2c0ff9bb6941d4448311 Mon Sep 17 00:00:00 2001
From: Tomasz Kajtoch <tomasz.kajtoch@elastic.co>
Date: Mon, 22 May 2023 22:02:03 +0200
Subject: [PATCH] fix(EuiCopy): fix code block copy button not including the
 last character if it's a question mark

---
 src/components/code/code_block_copy.tsx |  8 +++++++-
 src/components/code/utils.tsx           | 20 ++++++++++++++++++--
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/src/components/code/code_block_copy.tsx b/src/components/code/code_block_copy.tsx
index 3a341fafe083..3469810cc70f 100644
--- a/src/components/code/code_block_copy.tsx
+++ b/src/components/code/code_block_copy.tsx
@@ -11,6 +11,7 @@ import { useInnerText } from '../inner_text';
 import { EuiCopy } from '../copy';
 import { useEuiI18n } from '../i18n';
 import { EuiButtonIcon } from '../button';
+import { NEW_LINE_REGEX_GLOBAL } from './utils';
 
 /**
  * Hook that returns copy-related state/logic/utils
@@ -26,7 +27,12 @@ export const useCopy = ({
 }) => {
   const [innerTextRef, _innerText] = useInnerText('');
   const innerText = useMemo(
-    () => _innerText?.replace(/[\r\n?]{2}|\n\n/g, '\n') || '',
+    () =>
+      _innerText
+        // Normalize line terminations to match native JS format
+        ?.replace(NEW_LINE_REGEX_GLOBAL, '\n')
+        // Reduce two or more consecutive new line characters to a single one
+        .replace(/\n{2,}/g, '\n') || '',
     [_innerText]
   );
   const textToCopy = isVirtualized ? `${children}` : innerText; // Virtualized code blocks do not have inner text
diff --git a/src/components/code/utils.tsx b/src/components/code/utils.tsx
index 905774eec35b..6daa6156816a 100644
--- a/src/components/code/utils.tsx
+++ b/src/components/code/utils.tsx
@@ -41,6 +41,22 @@ export type EuiCodeSharedProps = CommonProps &
 export const SUPPORTED_LANGUAGES = listLanguages();
 export const DEFAULT_LANGUAGE = 'text';
 
+/**
+ * Platform-agnostic new line regex that safely matches all standard
+ * line termination conventions:
+ * - LF: Unix-based platforms and JS-native sources like text areas
+ * - CRLF: Windows
+ * - CR: Mac Classic; to support files saved a long time ago
+ */
+export const NEW_LINE_REGEX = /\r\n|\r|\n/;
+
+/**
+ * Platform-agnostic global new line regex that safely matches all standard
+ * line termination conventions.
+ * See [NEW_LINE_REGEX]{@link NEW_LINE_REGEX} for more details.
+ */
+export const NEW_LINE_REGEX_GLOBAL = new RegExp(NEW_LINE_REGEX, 'g');
+
 export const checkSupportedLanguage = (language: string): string => {
   return SUPPORTED_LANGUAGES.includes(language) ? language : DEFAULT_LANGUAGE;
 };
@@ -139,12 +155,12 @@ const addLineData = (
   return nodes.reduce<ExtendedRefractorNode[]>((result, node) => {
     const lineStart = data.lineNumber;
     if (node.type === 'text') {
-      if (!node.value.match(/\r\n?|\n/)) {
+      if (!node.value.match(NEW_LINE_REGEX)) {
         node.lineStart = lineStart;
         node.lineEnd = lineStart;
         result.push(node);
       } else {
-        const lines = node.value.split(/\r\n?|\n/);
+        const lines = node.value.split(NEW_LINE_REGEX);
         lines.forEach((line, i) => {
           const num = i === 0 ? data.lineNumber : ++data.lineNumber;
           result.push({